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Normal Force of incline plane
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AlexQR
#1 Posted : Monday, August 01, 2011 1:45:19 AM
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I was wondering for finding normal force which equation should I be using because CC say N=mg/cosθ but EK says N=mgcosθ So which one should I be using?
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asemac
#2 Posted : Monday, August 01, 2011 3:04:54 PM
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Fn = mgcosθ

Just think about it, there is only a normal force when there is a supporting surface, cos0=1 and cos90=0, so as the angle increases, normal force decreases.

I think you found the Fn=mg/cosθ from page 30 of the CC which is a specific example having to do with centripetal force. Page 24 and 25 has the explanation of normal force.

Hope that helps
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ftadros
#3 Posted : Sunday, August 07, 2011 9:56:38 PM
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Yeah N=mgcos(theta) is for an inclined plane but N=mg/cos(theta) is for the banked roads example
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